Cell c no joy.

September 2020 I was contacted by cell c for an upgrade on an existing cell c contract. When I tried to make a phone call from my cell c contract phone I had no airtime. When I contacted cell c they said that this contract that I was trying to phone from had no airtime, this was my original contract which should have been upgraded. This is when I found our that instead of upgrading my existing contract they sold me another contract with another cell phone number which I did not want. More than 2 years of being sent from pillar to post by cell c. None of the cell c departments will take responsibility for the error. Contract retention say it is sales fault, sales says new contracts department must sort it out. Nobody at cell c is able to help. It would seem the different departments at cell do not communicate well with each other. I want a full refund for the amount I have paid for the 2 year contract that I never wanted.